Device for automatically detecting paint spraying defects of steel pipe

Abstract

The invention provides an automatic detection device for paint spraying flaws of a steel pipe, and relates to the technical field of steel pipe paint surface detection. The detection mechanism comprises a detection block arranged on the moving mechanism through a distance adjusting assembly, a detection assembly arranged in a detection opening formed in the detection block, and a control assembly arranged on the detection block; the detection block is made of a material capable of generating elastic deformation; the distance adjusting assembly is used for controlling the detection block to move so that the end of the detection block can be tightly attached to the inner wall of the steel pipe, and a sealed cavity is formed between the detection opening and the inner wall. The control assembly adjusts the end curvature of the detection opening formed in the detection block; when the paint surface of the inner wall of the steel pipe is detected, the detection assembly is used for controlling the interior of the sealed cavity to be in a negative pressure state and collecting image data of the paint surface of the inner wall to identify flaws. The curvature of the end face of the detection block can be accurately controlled to be consistent with the curvature of the inner wall of the inner pipe of the steel pipe and be tightly attached, and high-precision detection of defects such as bubbles on the paint surface of the inner wall of the steel pipe is achieved.

Description

Technical Field

[0001] This invention relates to the field of steel pipe paint inspection technology, specifically to an automatic detection device for paint defects on steel pipes. Background Technology

[0002] In the steel pipe manufacturing industry, painting the inner wall of steel pipes is a crucial step in improving their corrosion resistance and extending their service life. However, the quality of the paint finish on the inner wall of steel pipes varies greatly, with defects such as uneven paint application, bubbles, scratches, and peeling. These defects can seriously affect the corrosion resistance and safety of the steel pipes, thus requiring rigorous testing of the paint finish on the inner wall of steel pipes.

[0003] Currently, the inspection process for defects in the paint coating on the inner wall of steel pipes has transitioned from manual inspection to automated mechanical inspection. Image acquisition is typically used to check for defects in the paint coating on the steel pipes. However, existing technologies for inspecting the paint coating on the inner wall of steel pipes have several drawbacks:

[0004] 1. Low detection accuracy: For some minor defects, especially air bubbles, under normal inspection conditions, the air bubbles are hidden inside the paint surface or are similar in color to the paint surface, making it difficult to accurately identify them using only ordinary image acquisition methods. Existing inspection technologies lack effective means to highlight these defect characteristics, resulting in insufficiently accurate inspection results that cannot meet the requirements for high-quality steel pipe production.

[0005] 2. Weak adaptability: Existing testing equipment has a relatively fixed structure, lacking flexibility and adjustability, making it difficult to adapt to the testing needs of steel pipes of different specifications. When testing steel pipes with different inner diameters or curvatures, it is necessary to replace them with specialized testing equipment or make complex adjustments, which not only increases testing costs and time but also reduces testing efficiency. Summary of the Invention

[0006] To address the aforementioned problems, this application provides an automatic detection device for paint defects on steel pipes.

[0007] To achieve the above objectives, this application provides the following technical solution: an automatic detection device for paint defects on steel pipes, comprising a moving mechanism that moves inside the steel pipe, and a detection mechanism disposed on the moving mechanism for detecting the paint surface on the inner wall of the steel pipe. The detection mechanism includes a detection block disposed on the moving mechanism via an adjustment component, a detection component disposed within a detection opening in the detection block, and a control component disposed on the detection block; the detection block is made of a material capable of elastic deformation.

[0008] The distance adjustment component is used to control the movement of the detection block, so that the end of the detection block fits tightly against the inner wall of the steel pipe, and a sealed cavity is formed between the detection port and the inner wall.

[0009] During the inspection of the paint finish on the inner wall of the steel pipe, the control component adjusts the curvature of the end of the inspection block that opens the inspection port to make it consistent with the curvature of the inner wall of the steel pipe.

[0010] When inspecting the paint finish on the inner wall of a steel pipe, the inspection component is used to control the sealed chamber to maintain a negative pressure state and collect image data of the inner wall paint finish to identify defects.

[0011] Preferably, the control assembly includes a lifting component positioned vertically at the center of the symmetrical wall of the detection port, two connecting blocks symmetrically arranged about the lifting component, and two control rods with one end rotatably connected to the output end of the lifting component and the other end rotatably connected to different connecting blocks; the side of the lifting component is fixedly connected to the wall of the detection port.

[0012] When the output end of the lifting component drives one end of the two control rods to move towards the bottom wall of the detection port, the end face of the detection port changes from a planar state to a curved surface, and the curvature gradually increases.

[0013] Preferably, the detection port wall is provided with adjustment grooves in the transverse direction at symmetrical positions about the lifting component; the control component also includes multiple adjustment blocks arranged at equal intervals along the length of the adjustment groove opening, the multiple adjustment blocks are rotatably connected to each other and form a long strip structure, and the adjustment block located at the end is fixedly set in the adjustment groove; the two adjustment blocks located away from the lifting component are respectively connected to different connecting blocks.

[0014] Preferably, the lifting component includes a vertical rod fixedly mounted on the wall of the detection port, an adjusting screw threaded through a vertical groove opened along the length of the vertical rod, and a control block threadedly mounted on the adjusting screw. The two ends of the control block extend to the side of the vertical rod and are rotatably connected to the ends of different control rods respectively. The adjusting screw is driven by a motor.

[0015] Preferably, the testing mechanism further includes a circumferential component for controlling the testing block to test the circumferential paint surface of the inner wall of the steel pipe. The circumferential component includes a rotating ring rotatably sleeved on the moving mechanism and a reciprocating component for controlling the rotatable ring to reciprocate axially. The axis of the rotating ring is parallel to the moving direction of the moving mechanism, and the outer ring surface of the rotating ring is connected to the testing block through an adjustment component.

[0016] Preferably, the reciprocating component includes an annular rack fixedly disposed on the end of the rotating ring, and a reciprocating motor disposed on the moving mechanism and having a control gear at its output end, wherein the control gear meshes with the annular rack.

[0017] Preferably, the adjusting component includes a rotating ring rotatably sleeved on the moving mechanism, a limiting tube that moves radially through the rotating ring, and an adjusting element disposed on the moving mechanism and located within the inner ring of the rotating ring. The adjusting element is used to control the movement of the limiting tube along the length direction. The two ends of the limiting tube are respectively connected to the bottom end of the detection block and the detection component, and the limiting tube communicates with the inside of the detection port. The axis of the rotating ring is parallel to the moving direction of the moving mechanism.

[0018] Preferably, the adjusting component includes a rotating disk located in the middle of the inner ring of the rotating ring, a limiting rod fixedly disposed on the side of the rotating disk, a limiting slider slidably passing through a limiting slot in the limiting rod body, and a motor disposed on the moving mechanism and controlling the rotating disk to rotate around the axis, wherein the limiting rod body is tangent to the side of the rotating disk.

[0019] Preferably, the moving mechanism includes a columnar support frame consisting of two support rings and a fixed ring, and a moving component disposed on the columnar support frame. The support rings and the fixed ring are parallel to each other, and the two support rings are symmetrically arranged about the fixed ring. A detection block is connected to the columnar support frame via an adjustment component.

[0020] Preferably, the moving component includes at least three sets of connectors arranged in a circumferential array on the opposite surfaces of the support ring and the fixed ring, two drive wheels disposed on each set of connectors, and an elastic element disposed on each set of connectors. The elastic element connects the two drive wheels corresponding to each set of connectors, so that the two drive wheels have a tendency to move away from the connectors.

[0021] The beneficial effects of this invention are:

[0022] 1. By controlling the curvature of the inspection port end face of the inspection block to match the curvature of the inner wall of the steel pipe, and simultaneously using an adjustable gap assembly to ensure a tight fit between the end of the inspection block and the inner wall, this design allows the inspection block to perfectly adapt to the inner wall curvature of steel pipes of different sizes. Regardless of changes in the inner diameter and curvature of the steel pipe, the inspection block can maintain close contact with the painted surface, forming a relatively stable inspection environment. This provides a solid foundation for subsequent accurate inspection, avoids inspection errors caused by insufficient fit, and improves the accuracy and reliability of the inspection.

[0023] 2. The detection component creates negative pressure inside the sealed chamber and acquires image data of the paint surface under this negative pressure. Under negative pressure, paint surfaces with air bubbles will bulge due to the pressure difference, making the bubble features more prominent. By acquiring image data under this special condition, the location, size, and shape of the bubbles can be clearly captured, effectively improving the accuracy and precision of defect detection.

[0024] 3. By controlling the curvature of the end face of the detection block, it meets the inspection requirements of steel pipe inner walls with different curvatures, making it easy to apply to the inspection of steel pipes of various specifications without the need to replace specialized equipment or make complex adjustments. This not only reduces inspection costs but also greatly shortens inspection preparation time and improves inspection efficiency, better meeting the needs of large-scale steel pipe production. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 This is a simplified structural diagram of the automatic detection device for paint defects on steel pipes proposed in this invention.

[0027] Figure 2 This is a schematic diagram of the cross-sectional structure of the detection block of the present invention.

[0028] Figure 3 This is a schematic diagram of the cross-sectional unfolded structure of the detection block and control component of the present invention.

[0029] Figure 4 This is a schematic diagram of the structure of the detection block after the curvature of the end is adjusted according to the present invention.

[0030] Figure 5 This is a schematic diagram of the cross-sectional structure of the end curvature adjustment state of the detection block of the present invention.

[0031] Figure 6 This is a schematic diagram of the storage structure of the automatic detection device for paint defects on steel pipes proposed in this invention.

[0032] Figure 7 This is a schematic diagram of the unfolded structure of the automatic detection device for paint defects on steel pipes proposed in this invention.

[0033] Figure 8 This is a schematic diagram of the adjustable distance assembly of the present invention mounted on a columnar support frame.

[0034] Figure 9 This is a schematic diagram of the adjustable distance component and the column support frame in the separated state of the present invention.

[0035] Figure 10 This is a schematic diagram of the adjustable distance component structure of the present invention.

[0036] In the diagram: 1. Support ring; 2. Fixed ring; 3. Slide rod; 4. Slider; 5. Limiting spring; 6. Rotating rod; 7. Drive wheel; 8. Linkage rod; 9. Limiting tube; 10. Detection block; 11. Adjusting groove; 12. Adjusting block; 13. Vertical rod; 14. Vertical groove; 15. Control block; 16. Control rod; 17. Detection module; 18. Rotating groove; 19. Rotating ring; 20. Mounting plate; 21. Reciprocating slot; 22. Rotating disk; 23. Limiting rod; 24. Limiting slot; 25. Limiting slider; 26. Control gear. Detailed Implementation

[0037] To make the technical means, creative features, achieved objectives, and effects of this invention readily understandable, the invention is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention.

[0038] To address the difficulties in identifying hidden defects and poor adaptability of existing steel pipe inner wall paint surface inspection technologies, and to improve the accuracy, comprehensiveness, and efficiency of steel pipe inner wall paint surface defect detection, this invention proposes an automatic steel pipe paint defect detection device. This device controls the curvature of the detection port end face of a detection block 10 mounted on a moving mechanism to match the curvature of the steel pipe's inner wall. An adjusting component ensures a tight fit between the end of the detection block 10 and the inner wall. Simultaneously, the detection component applies negative pressure to the inside of the detection port and acquires paint surface image data under negative pressure to achieve accurate defect detection. The adjusting component can adjust the position of the detection block 10 according to the curvature of the inner wall of steel pipes of different sizes, ensuring a tight fit. The control component can flexibly adjust the curvature of the detection port end face to adapt to various steel pipe inner wall curvatures. The detection component acquires images under negative pressure, effectively identifying hidden defects such as air bubbles. This design not only significantly improves the accuracy and comprehensiveness of the detection but also enhances the device's adaptability to steel pipes of different specifications, reducing inspection costs and time.

[0039] Example 1: Reference Figures 1-10 An automatic detection device for paint defects on steel pipes is shown, comprising a moving mechanism that moves inside the steel pipe and a detection mechanism disposed on the moving mechanism to detect the paint surface on the inner wall of the steel pipe. The detection mechanism includes a detection block 10 disposed on the moving mechanism via an adjustment component, a detection component disposed within a detection port on the detection block 10, and a control component disposed on the detection block 10. The detection block 10 is made of a material capable of elastic deformation. The detection block 10 can be made of flexible and elastic materials such as silicone rubber and thermoplastic polyurethane elastomer, so that the subsequent control component can adjust the curvature of the end of the detection block 10 to adapt to the curvature of the inner wall of steel pipes of different sizes. The detection component includes a detection module 17 installed in the detection port. The detection module 17 consists of a light source, an industrial camera, a control unit, a vacuum component, and a pressure sensor disposed in the detection port. It is used to apply a negative pressure state to the paint surface on the inner wall of the steel pipe and to acquire image data under this state to identify defects. The pressure sensor is specifically a piezoresistive pressure sensor or a piezoelectric pressure sensor, used to detect the negative pressure in the sealed chamber.

[0040] The adjustment component is used to control the movement of the detection block 10, so that the end of the detection block 10 fits tightly against the inner wall of the steel pipe, and a sealed chamber is formed between the detection port and the inner wall; the sealed chamber provides a sealed basis for the detection component to apply negative pressure to the paint surface of the inner wall of the steel pipe.

[0041] During the inspection of the paint finish on the inner wall of the steel pipe, the control component adjusts the curvature of the end of the inspection block 10 with the inspection port so that it matches the curvature of the inner wall of the steel pipe.

[0042] When inspecting the paint finish on the inner wall of a steel pipe, the inspection component is used to control the sealed chamber to maintain a negative pressure state and collect image data of the inner wall paint finish to identify defects.

[0043] like Figures 1-5 As shown, in this embodiment, when detecting paint defects inside a steel pipe, the curvature of the end of the detection block 10 with the inner wall of the steel pipe is first adjusted by the control component to ensure consistency with the curvature of the detection port. This provides a basis for detecting paint defects on the inner wall of steel pipes of different sizes. Then, the distance between the detection block 10 and the inner wall is adjusted by the distance adjustment component, pushing the end of the detection block 10 to fit against the inner wall. When the curvature of the end of the detection block 10 matches the curvature of the inner wall, a tight seal between the end of the detection block 10 and the inner wall is ensured, forming a sealed chamber. At this time, the detection component first evacuates the inside of the sealed chamber to provide a negative pressure environment and collects the paint image data under the negative pressure environment. When there are air bubbles in the paint, the position of the air bubble will bulge under the negative pressure environment, so that the position of the air bubble can be clearly captured by the image data, thus improving the accuracy and precision of detecting paint defects on the inner wall of the steel pipe.

[0044] like Figures 2-5 As shown, the control assembly includes a lifting component positioned vertically at the center of the symmetrical wall of the detection port, two connecting blocks symmetrically arranged about the lifting component, and two control rods 16, one end of which is rotatably connected to the output end of the lifting component and the other end of which is rotatably connected to different connecting blocks; the side of the lifting component is fixedly connected to the wall of the detection port.

[0045] When the output end of the lifting component moves one end of the two control rods 16 toward the bottom wall of the detection port, the other end of the two control rods 16 moves both sides of the detection port wall downwards. Based on the fixed connection between the lifting component and the port wall, the end face of the detection port is controlled to transform from a planar state to a curved surface, with the curvature gradually increasing. This meets the requirements for the end face shape of the detection block 10 in different sized steel pipe inner wall paint surface inspection scenarios, such as... Figure 2 The end face of detection block 10 is converted from a planar state to a flat state. Figure 5 The end face of the test block 10 is curved. The precise movement of the two control rods 16 is controlled by the lifting component, which makes it easy to control the curvature of the end of the test block 10 to be consistent with the curvature of the inner wall of the steel pipe to be tested. This ensures a tight seal between the end of the test block 10 and the inner wall, which is beneficial for subsequent testing work, ensures the reliability and validity of the test data, and avoids deviations in the test results due to poor sealing.

[0046] like Figures 2-5As shown, the detection port wall is provided with adjustment grooves 11 in the transverse direction at symmetrical positions about the lifting component; the control component also includes a plurality of adjustment blocks 12 arranged at equal intervals along the opening length of the adjustment grooves 11, the plurality of adjustment blocks 12 are rotatably connected to each other and form a long strip structure, and the adjustment block 12 located at the end is fixedly installed in the adjustment groove 11; the two adjustment blocks 12 located away from the lifting component are respectively connected to different connecting blocks.

[0047] This embodiment further defines the curvature adjustment of the end face of the detection block 10. First, when the lifting component moves one end of the two control rods 16 in the vertical direction, the two control rods 16 move the two adjustment blocks 12 away from the lifting component downward. At this time, the multiple adjustment blocks 12 of the elongated structure rotate downward synchronously and adaptively. The multiple adjustment blocks 12 apply downward pulling force evenly to each point along the length of the adjustment grooves 11 on both sides of the lifting component, stably controlling the synchronous downward movement of the two sides of the detection port symmetrical about the lifting component. This accurately controls the transformation of the end face of the detection block 10 from a planar state to a curved state, making it easier to flexibly adjust the curvature of the end of the detection port, and better adapting to the inner walls of the steel pipes to be tested with different specifications and different curvature changes.

[0048] In this embodiment, the curvature of the detection block 10 is adjusted by multiple adjusting blocks 12 arranged in a long strip structure within the adjusting groove 11. Compared to simply moving the sides of the detection port groove downwards using only two rotating blocks, the multiple adjusting blocks 12 are arranged at equal intervals and rotated and connected to each other. This allows the force transmitted from the control rod 16 to be evenly distributed across the entire long strip structure, preventing excessive local stress that could lead to structural damage or deformation. Simultaneously, this force distribution also helps to more smoothly change the shape of the detection port end, resulting in a more uniform and continuous change in curvature.

[0049] It is understandable that the vertical distance between one end of the two control levers 16 can be adjusted in various ways. This embodiment provides the following solution:

[0050] like Figure 2 and Figure 3 As shown, the lifting component includes a vertical rod 13 fixedly installed on the wall of the detection port, an adjusting screw threaded through a vertical groove 14 opened along the length of the vertical rod 13, and a control block 15 threadedly connected to the adjusting screw. The two ends of the control block 15 extend to the side of the vertical rod 13 and are rotatably connected to the ends of different control rods 16 respectively. The adjusting screw is driven by a motor.

[0051] In this embodiment, the adjustment screw is rotated by a motor, and the control block 15 moves precisely in a straight line along the adjustment screw according to the rotation direction and number of turns of the adjustment screw. By controlling the speed and direction of rotation of the motor, the moving distance and speed of the control block 15 can be precisely controlled, thereby achieving fine adjustment of the curvature of the end of the detection block 10 and meeting the detection requirements of steel pipes of different specifications.

[0052] Example 2: In the case of Example 1, which only allows for the detection of the paint surface of the inner wall of the steel pipe in a single direction by using the adjustment component to drive the detection block 10 to fit, and cannot achieve comprehensive detection of the circumferential paint surface of the inner wall of the steel pipe, this example provides the following solution.

[0053] like Figure 1 As shown, the detection mechanism also includes a circumferential component for controlling the detection block 10 to detect the circumferential paint surface of the inner wall of the steel pipe. The circumferential component includes a rotating ring 19 rotatably sleeved on the moving mechanism and a reciprocating component for controlling the rotating ring 19 to reciprocate around the axial direction. The axis of the rotating ring 19 is parallel to the moving direction of the moving mechanism, and the outer ring surface of the rotating ring 19 is connected to the detection block 10 through the pitch adjustment component.

[0054] In this embodiment, the rotating ring 19 and the reciprocating component work together to drive the detection block 10 to reciprocate circumferentially around the inner wall of the steel pipe. This allows the detection block 10 to cover the entire circumference of the steel pipe's inner wall, achieving comprehensive inspection of the circumferential paint surface. This effectively avoids missed detections due to limited inspection range, significantly improving the completeness and accuracy of the inspection. In practical applications, the quality requirements for the paint surface of the steel pipe's inner wall may vary depending on the usage scenario and standards. In some cases, a detailed inspection of the entire circumference of the steel pipe's inner wall is required to ensure the uniformity and integrity of the paint surface. The design of this circumferential component can meet these diverse inspection needs, providing a more flexible and comprehensive solution for inspecting the paint surface of steel pipes with different specifications and requirements.

[0055] like Figures 7-10 As shown, the reciprocating component includes an annular rack fixedly mounted on the end of the rotating ring 19, and a reciprocating motor mounted on the moving mechanism and having a control gear 26 at its output end. The control gear 26 meshes with the annular rack.

[0056] In this embodiment, the reciprocating motor acts as a driving source through the meshing transmission between gears, controlling the rotating ring 19 to reciprocate around the axis direction. The range of rotation of the rotating ring 19 around the axis direction is between -360° and 360°.

[0057] In this embodiment, when the number of detection blocks 10 is N, the range of rotation of the rotating ring 19 around the axis is: arrive between.

[0058] Example 3: Regarding the distance adjustment component for controlling the distance between the detection block 10 and the inner wall of the steel pipe in Example 1, this example provides the following solution.

[0059] like Figures 6-10As shown, the adjusting component includes a rotating ring 19 rotatably sleeved on the moving mechanism, a limiting tube 9 that moves radially through the rotating ring 19, and an adjusting element disposed on the moving mechanism and located within the inner ring of the rotating ring 19. The adjusting element is used to control the movement of the limiting tube 9 along the length direction. The two ends of the limiting tube 9 are respectively connected to the bottom end of the detection block 10 and the detection component, and the limiting tube 9 communicates with the inside of the detection port. The axis of the rotating ring 19 is parallel to the moving direction of the moving mechanism.

[0060] In this embodiment, the limiting tube 9 moves radially through the rotating ring 19. This structure allows the limiting tube 9 to move to a certain extent in the radial direction of the rotating ring 19, thereby controlling the end of the detection block 10 to fit against the inner wall of the steel pipe to adapt to the detection requirements at different positions.

[0061] In this embodiment, the limiting tube 9 is connected to the vacuum assembly. When the end of the detection block 10 is sealed and attached to the inner wall of the steel pipe, the vacuum assembly evacuates the sealed chamber through the limiting tube 9, so that the paint surface of the inner wall of the steel pipe located in the sealed chamber is in a vacuum environment, which facilitates subsequent image acquisition of the paint surface and defect detection.

[0062] It is understandable that the radial movement distance of the limiting tube 9 in the rotating ring 19 can be achieved in various ways. This embodiment provides the following solution:

[0063] like Figure 10 As shown, the adjusting component includes a rotating disk 22 located in the middle of the inner ring of the rotating ring 19, a limiting rod 23 fixedly installed on the side of the rotating disk 22, a limiting slider 25 slidably passing through the limiting slot 24 opened in the rod body of the limiting rod 23, and a motor installed on the moving mechanism to control the rotating disk 22 to rotate around the axis. The rod body of the limiting rod 23 and the side of the rotating disk 22 ensure the smoothness and reliability of the entire adjusting component.

[0064] Example 4: Regarding the moving mechanism that controls the movement of the detection mechanism inside the steel pipe in Example 1, this example provides the following solution.

[0065] like Figure 1 and Figure 6As shown in Figure 9, the moving mechanism includes a columnar support frame consisting of two support rings 1 and one fixed ring 2, and a moving component mounted on the columnar support frame. The support rings 1 and the fixed ring 2 are parallel to each other, and the two support rings 1 are symmetrically arranged about the fixed ring 2. A detection block 10 is connected to the columnar support frame via an adjustment component. A mounting plate 20 is provided inside the columnar support frame, on which a power supply, a vacuum pump component (miniature vacuum pump), a control module, etc., can be mounted. The shape design of the columnar support frame increases the rigidity of the structure. Compared with other irregular shapes, the columnar structure can better resist bending and torsional deformation under the same load, providing a solid foundation for the moving component and the adjustment component, ensuring that the entire moving mechanism maintains a stable shape during operation and improving the reliability of detection.

[0066] In this embodiment, a rotating groove 18 matching the rotating ring 19 is provided on the outer ring of the fixed ring 2. The rotating ring 19 can rotate stably in the rotating groove 18, providing a stable rotation basis for controlling the detection mechanism to perform circumferential reciprocating motion around the inner wall of the steel pipe. A reciprocating slot hole 21 penetrating the inner ring of the rotating ring 19 is provided at the bottom of the rotating groove 18. When the rotating ring 19 is rotated and sleeved in the rotating groove 18, the limiting tube 9 passes through the reciprocating slot hole 21 in the inner ring of the fixed ring 2.

[0067] It is understandable that the movement of the column support frame within the steel pipe can be controlled in various ways. This embodiment provides the following solution:

[0068] like Figure 1 As shown, the moving component includes at least three sets of connectors arranged in a circular array on the opposite surfaces of the support ring 1 and the fixed ring 2, two drive wheels 7 disposed on each set of connectors, and an elastic element disposed on each set of connectors. The elastic element connects the two drive wheels 7 corresponding to each set of connectors, so that the two drive wheels 7 have a tendency to move away from the connectors. Each drive wheel 7 is driven by an independent motor. Each set of connectors uses two slide rods 3 symmetrically arranged about the fixed ring 2 to connect adjacent support rings 1 and fixed rings 2, and the length direction of the slide rods 3 is perpendicular to the end face of the fixed ring 2.

[0069] In this embodiment, when the moving component drives the columnar support frame to move inside the steel pipe, it controls multiple drive wheels 7 to move towards the connecting member. Then, the columnar support frame is inserted into the steel pipe and the control of the drive wheels 7 is released. Under the action of the elastic element, the drive wheels 7 will move away from the connecting member. At this time, the drive wheels 7 are tightly attached to the inner wall of the steel pipe under the pushing action of the elastic element. With the help of multiple independent motors driving the drive wheels 7 to rotate synchronously at the same speed, it is easy to control the accurate movement of the columnar support frame and the detection mechanism located on it inside the steel pipe. Combined with the detection mechanism to detect defects in the paint surface of the inner wall of the steel pipe, it realizes fully automated inspection of the paint surface of the inner wall of the steel pipe, which greatly improves the inspection efficiency and reduces labor costs.

[0070] It is understandable that the two drive wheels 7 can have a tendency to move away from the connecting member through various flexible methods. This embodiment provides the following solution:

[0071] like Figure 1 As shown, the elastic element includes a slider 4 slidably sleeved on the slide rod 3, a limiting spring 5 sleeved on the slide rod 3 and connected at both ends to the opposite ends of each set of two slide rods 3 and the slider 4, two rotating rods 6 with one end rotatably mounted on the two support rings 1 near the opposite ends of each set of two slide rods 3, and a linkage rod 8 with both ends rotatably connected to the middle of the rotating rod 6 and the side of the slider 4 respectively. The end of the rotating rod 6 away from the support ring 1 is rotatably connected to the drive wheel 7. When the two sliders 4 are respectively located on the opposite ends of each set of two slide rods 3, the limiting spring 5 is in a normal extension and contraction state; when the two sliders 4 are respectively located on the opposite ends of each set of two slide rods 3, the limiting spring 5 is in a compressed state.

[0072] In this embodiment, when the columnar support frame is inserted axially into steel pipes of different sizes, each set of rotating rods 6 is first rotated to bring them closer together. Then, the columnar support frame is inserted into the steel pipe. The control of the rotating rods 6 is released, and under the elastic force of the limit spring 5, the two sliders 4 will be pushed away from each other. Under the action of the linkage rod 8, the two rotating rods 6 will be driven to rotate away from each other, so that the drive wheel 7 at the end of the rotating rod 6 is in contact with the inner wall of the steel pipe of different sizes. In conjunction with the detection mechanism set on the columnar support frame, the paint surface of the inner wall of the steel pipe is detected, which facilitates the detection of the paint surface of the inner wall of steel pipes of various sizes and improves the adaptability of the device.

[0073] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic detection device for paint defects on steel pipes, comprising a moving mechanism that moves inside the steel pipe, and a detection mechanism disposed on the moving mechanism to detect the paint surface on the inner wall of the steel pipe, characterized in that, The detection mechanism includes a detection block (10) mounted on a moving mechanism via an adjustment component, a detection component disposed within a detection port on the detection block (10), and a control component disposed on the detection block (10); the detection block (10) is made of a material capable of elastic deformation; The distance adjustment component is used to control the movement of the detection block (10), so that the end of the detection block (10) fits tightly against the inner wall of the steel pipe, and a sealed cavity is formed between the detection port and the inner wall; During the inspection of the paint surface on the inner wall of the steel pipe, the control component adjusts the curvature of the end of the inspection block (10) to make it consistent with the curvature of the inner wall of the steel pipe; When inspecting the paint finish on the inner wall of a steel pipe, the inspection component is used to control the sealed chamber to maintain a negative pressure state and collect image data of the inner wall paint finish to identify defects.

2. The automatic detection device for paint defects on steel pipes according to claim 1, characterized in that: The control assembly includes a lifting component positioned vertically at the center of the symmetrical wall of the detection port, two connecting blocks symmetrically arranged about the lifting component, and two control rods (16) with one end rotatably connected to the output end of the lifting component and the other end rotatably connected to different connecting blocks respectively; the side of the lifting component is fixedly connected to the wall of the detection port; When the output end of the lifting component drives one end of the two control rods (16) to move towards the bottom wall of the detection port, the end face of the detection port changes from a planar state to a curved surface, and the curvature gradually increases.

3. The automatic detection device for paint defects on steel pipes according to claim 2, characterized in that: The detection port wall is provided with adjustment grooves (11) at symmetrical positions about the lifting component. The control component also includes multiple adjustment blocks (12) arranged at equal intervals along the opening length of the adjustment grooves (11). The multiple adjustment blocks (12) are rotatably connected to each other and form a long strip structure. The adjustment block (12) at the end is fixedly set in the adjustment groove (11). The two adjustment blocks (12) located away from the lifting component are respectively connected to different connecting blocks.

4. The automatic detection device for paint defects on steel pipes according to claim 2 or 3, characterized in that: The lifting component includes a vertical rod (13) fixedly installed on the wall of the detection port, an adjusting screw threaded through a vertical groove (14) opened along the length direction of the vertical rod (13), and a control block (15) threadedly connected to the adjusting screw thread. The two ends of the control block (15) extend to the side of the vertical rod (13) and are rotatably connected to the ends of different control rods (16). The adjusting screw thread is driven by a motor.

5. The automatic detection device for paint defects on steel pipes according to claim 1, characterized in that: The testing mechanism also includes a circumferential component for controlling the testing block (10) to test the circumferential paint surface of the inner wall of the steel pipe. The circumferential component includes a rotating ring (19) rotatably sleeved on the moving mechanism and a reciprocating component for controlling the rotating ring (19) to reciprocate around the axial direction. The axis of the rotating ring (19) is parallel to the moving direction of the moving mechanism, and the outer ring surface of the rotating ring (19) is connected to the testing block (10) through the pitch adjustment component.

6. The automatic detection device for paint defects on steel pipes according to claim 5, characterized in that: The reciprocating component includes an annular rack fixedly mounted on the end of the rotating ring (19) and a reciprocating motor mounted on the moving mechanism and having a control gear (26) at its output end, wherein the control gear (26) meshes with the annular rack.

7. The automatic detection device for paint defects on steel pipes according to claim 1, characterized in that: The adjusting component includes a rotating ring (19) rotatably sleeved on the moving mechanism, a limiting tube (9) that moves radially through the rotating ring (19), and an adjusting element disposed on the moving mechanism and located in the inner ring of the rotating ring (19). The adjusting element is used to control the movement of the limiting tube (9) along the length direction. The two ends of the limiting tube (9) are respectively connected to the bottom end of the detection block (10) and the detection component, and the limiting tube (9) is in communication with the inside of the detection port. The axis of the rotating ring (19) is parallel to the moving direction of the moving mechanism.

8. The automatic detection device for paint defects on steel pipes according to claim 7, characterized in that: The adjusting component includes a rotating disk (22) located in the middle of the inner ring of the rotating ring (19), a limiting rod (23) fixedly installed on the side of the rotating disk (22), a limiting slider (25) slidably passing through the limiting slot (24) in the rod body of the limiting rod (23), and a motor installed on the moving mechanism to control the rotating disk (22) to rotate around the axis. The rod body of the limiting rod (23) is tangent to the side of the rotating disk (22).

9. The automatic detection device for paint defects on steel pipes according to claim 1, characterized in that: The moving mechanism includes a columnar support frame consisting of two support rings (1) and a fixed ring (2), and a moving component set on the columnar support frame. The support rings (1) and the fixed ring (2) are parallel to each other, and the two support rings (1) are symmetrically arranged about the fixed ring (2). A detection block (10) is connected to the columnar support frame through an adjustment component.

10. The automatic detection device for paint defects on steel pipes according to claim 9, characterized in that: The moving component includes at least three sets of connectors arranged in a circular array on the opposite surfaces of the support ring (1) and the fixed ring (2), two drive wheels (7) on each set of connectors, and an elastic element on each set of connectors. The elastic element connects the two drive wheels (7) corresponding to each set of connectors, so that the two drive wheels (7) have a tendency to move away from the connectors.

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